Method for evaluating reproducibility of toning sample by CCM

Abstract

Under the conditions that there are 2 or more samples produced in a CCM toning or visual toning process by which colors are adapted to the target color and respective components such as a coloring agent defining the sample color are registered in a CCM system, the reproducibility of the samples is evaluated based on the difference ΔR−n (n denotes a sample number) between spectral reflectance RST−n obtained by actually measuring the respective samples and spectral reflectance RPR−n obtained by the CCM simulation corresponding to the coloring agent recipe for the sample color at the same n, and determination whether toning work should be continued or not is rapidly and simply performed. On the other hand, when an abnormal sample is perceived, the difference ΔR′−b of the sample obtained from the specified equations is determined and, by comparison of the difference between the target color and a color of a toning sample in the color matching process, components such as a coloring agent mixed into the abnormal sample is presumed and its mixed amount is presumed.

1. A method for evaluating a reproducibility of a toning sample by CCM, wherein two or more samples are produced in a CCM toning or visual toning process by which colors are adapted to a target color and respective components are registered in a CCM system, comprising:
 evaluating the reproducibility of the samples based on a difference of spectral reflectance ΔR−n, wherein n denotes a sample number, between spectral reflectance RST−n obtained by measuring the respective samples and spectral reflectance RPR−n obtained by a CCM simulation corresponding to a coloring agent recipe for the sample at a same n; 
 wherein the evaluating is performed based on a difference of color specification value ΔL*a*b* corresponding to the difference ΔR−n or a difference of spectral transmittance ΔT−n, a statistical value including at least one of a maximum, minimum or a standard deviation of the difference of color specification value and a color difference as well as the color difference calculated from the statistical value. 
 
   
   
     2. A method for evaluating the reproducibility of a toning sample by CCM, which comprises incorporating the method for evaluating the reproducibility of a toning sample as defined in  claim 1  into a CCM software and calculating the coloring agent recipe by CCM system and, thereby, the reproducibility can be confirmed. 
   
   
     3. A method for evaluating a toning sample, wherein two or more samples are produced in a CCM toning or visual toning process by which colors are adapted to a target color and respective components are registered in a CCM system, comprising:
 evaluating a reproducibility of the samples based on a difference ΔR−n, wherein n denotes a sample number, between spectral reflectance RST−n obtained by measuring the respective samples and spectral reflectance RPR−n obtained by a CCM simulation corresponding to a coloring agent recipes for the sample at a same n, comprising the steps of: 
 extracting a sample indicating an abnormal value ΔR−b, wherein b denotes a bad value, different from others among ΔR−n of sample groups; and 
 choosing at least one of a coloring agent component mixed in the sample indicating the abnormal value or estimating a mixed amount of the coloring agent component, said estimating including the steps of:
 calculating either of n except for b among the ΔR−n or an average of ΔR−n except for b, wherein the measured spectral reflectance of a sample indicating the abnormal value is RST−b and spectral reflectance obtained by CCM simulation corresponding to the coloring agent recipe is RPR−b; 
 adding a calculated value obtained in said calculating to spectral reflectance RPR−b by CCM system to obtain a corrected provisional true value RST′−b; 
 determining a difference ΔR′−b between a provisional true value RST′−b and a measured spectral reflectance RST−b; 
 using the measured spectral reflectance RST−b minus ΔR−ave as a corrected target color, obtaining spectral reflectance RPR−m obtained by simulation from an existing CCM data for toning to the corrected target color, and obtaining the difference ΔR−m between the spectral reflectance RPR−m and the simulated spectral reflectance RPR−b by CCM system; and 
 determining a difference ΔR−m so that the difference between the ΔR′−b and the difference ΔR−m becomes minimum; 
 
 wherein a difference of color specification value or color difference obtained based on the difference ΔR−n is used in place of the difference ΔR−n. 
 
   
   
     4. A method for evaluating a reproducibility of a toning sample by CCM, wherein two or more samples are produced in a CCM toning or visual toning process by which colors are adapted to a target color and respective components are registered in a CCM system, comprising:
 evaluating the reproducibility of the samples based on a difference of spectral transmittance ΔT−n, wherein n denotes a sample number, between spectral transmittance TST−n obtained by measuring the respective samples and spectral transmittance TPR−n obtained by a CCM simulation corresponding to a coloring agent recipe for the sample at a same n; 
 wherein the evaluating is performed based on a difference of color specification value ΔL*a*b* corresponding to a difference of spectral reflectance ΔR−n or the difference ΔT−n, a statistical value including at least one of a maximum, minimum or a standard deviation of the difference of color specification value and a color difference as well as the color difference calculated from the statistical value. 
 
   
   
     5. A method for evaluating a reproducibility of a toning sample by CCM, which comprises incorporating the method for evaluating the reproducibility of a toning sample as defined in  claim 4  into a CCM software and calculating the coloring agent recipe by CCM system and, thereby, the reproducibility can be confirmed. 
   
   
     6. A method for evaluating a reproducibility of a toning sample by CCM, wherein two or more samples are produced in a CCM toning or visual toning process by which colors are adapted to a target color and respective components are registered in a CCM system, comprising:
 evaluating the reproducibility of the samples based on a difference of spectral reflectance ΔR−n, wherein n denotes a sample number, between spectral reflectance RST−n obtained by measuring the respective samples and spectral reflectance RPR−n obtained by a CCM simulation corresponding to a coloring agent recipe for the sample at a same n; 
 wherein the evaluating the reproducibility of the samples is performed from the difference between either of n for ΔR−n, or an average for ΔR−n and the ΔR−n; and 
 wherein the evaluating is performed based on a difference of color specification value ΔL*a*b* corresponding to the difference ΔR−n or a difference of spectral transmittance ΔT−n a statistical value including at least one of a maximum, minimum or standard deviation of the difference of color specification value and a color difference as well as the color difference calculated from the statistical value. 
 
   
   
     7. A method for evaluating the reproducibility of a toning sample by CCM, which comprises incorporating the method for evaluating the reproducibility of a toning sample as defined in  claim 6  into a CCM software and calculating the coloring agent recipe by CCM system and, thereby, the reproducibility can be confirmed. 
   
   
     8. A method for evaluating a reproducibility of a toning sample by CCM according to  claim 4 , wherein two or more samples are produced in a CCM toning or visual toning process by which colors are adapted to a target color and respective components are registered in a CCM system, comprising:
 evaluating the reproducibility of the samples based on a difference of spectral transmittance ΔT−n, wherein n denotes a sample number, between spectral transmittance TST−n obtained by measuring the respective samples and spectral transmittance TPR−n obtained by a CCM simulation corresponding to a coloring agent recipe for the sample at a same n; 
 wherein the evaluating the reproducibility of the samples is performed from the difference between either of n for ΔT−n, or an average for ΔT−n and the ΔT−n; and 
 wherein the evaluating is performed based on the difference of color specification value ΔL*a*b* corresponding to a difference of spectral reflectance ΔR−n or the difference ΔT−n, a statistical value including at least one of a maximum, minimum or standard deviation of the difference of color specification value and a color difference as well as the color difference calculated from the statistical value. 
 
   
   
     9. A method for evaluating the reproducibility of a toning sample by CCM, which comprises incorporating the method for evaluating the reproducibility of a toning sample as defined in  claim 8  into a CCM software and calculating the coloring agent recipe by CCM system and, thereby, the reproducibility can be confirmed. 
   
   
     10. A method for evaluating a toning sample, wherein two or more samples are produced in a CCM toning or visual toning process by which colors are adapted to a target color and respective components are registered in a CCM system, comprising:
 evaluating a reproducibility of the samples based on a difference ΔT−n, wherein n denotes a sample number, between spectral transmittance TST−n obtained by measuring the respective samples and spectral transmittance TPR−n obtained by a CCM simulation corresponding to a coloring agent recipes for the sample at a same n, comprising the steps of: 
 extracting a sample indicating an abnormal value ΔT−b, wherein b denotes a bad value, different from others among ΔT−n of a sample groups; and 
 choosing at least one of a coloring agent component mixed in the sample indicating the abnormal value or estimating a mixed amount of the coloring agent component, said estimating including the steps of:
 calculating either of n except for b among the ΔT−n or an average of ΔT−n except for b, wherein the measured spectral transmittance of a sample indicating the abnormal value is TST−b and spectral transmittance obtained by CCM simulation corresponding to the coloring agent recipe is TPR−b; 
 adding a calculated value obtained in said calculating to spectral transmittance TPR−b by CCM system to obtain a corrected provisional true value TST′−b; 
 determining a difference ΔT′−b between a provisional true value ΔTST′−b and a measured spectral transmittance ΔTST−b; 
 using the measured spectral transmittance ΔTST−b minus ΔT−ave as a corrected target color, obtaining spectral transmittance TPR−m obtained by simulation from an existing CCM data for toning to the corrected target color, and obtaining the difference ΔT−m between the spectral transmittance TPR−m and the simulated spectral transmittance TPR−b by CCM system; and 
 determining a difference ΔT−m so that the difference between the ΔT′−b and the difference ΔT−m becomes minimum; 
 
 wherein a difference of color specification value or color difference obtained based on the difference ΔT−n is used in place of the difference ΔT−n.